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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2014
Income Taxes [Abstract] |
Components of provision (benefit) for income taxes | The components of the provision (benefit) for income taxes are summarized below (in thousands):
| Years Ended December 31,
| 2014 | 2013 | 2012
Current: |  |  |  |  |  |  |  |  |
Federal | $ | — |  | $ | — |  | $ | — |
State |  | 2 |  |  | 13 |  |  | (113 | )
Foreign |  | 213 |  |  | 175 |  |  | 966 |
Total current |  | 215 |  |  | 188 |  |  | 853 |
Deferred: |  |  |  |  |  |  |  |  |
Federal |  | — |  |  | — |  |  | — |
State |  | — |  |  | — |  |  | — |
Total deferred |  | — |  |  | — |  |  | — |
Total net provision for income taxes | $ | 215 |  | $ | 188 |  | $ | 853 |
Reconciliation of effective income tax rates and U.S. statutory federal income tax rate | A reconciliation of the effective income tax rates and the U.S. statutory federal income tax rate is summarized below:
| Years Ended December 31,
| 2014 | 2013 | 2012
Statutory federal income tax rate |  | 35.0 | % |  | 35.0 | % |  | 35.0 | %
State income taxes, net of federal tax benefits |  | (0.2 | ) |  | (0.1 | ) |  | (1.0 | )
Change in valuation allowance |  | (695.8 | ) |  | (111.8 | ) |  | 23.3 |
Stock compensation |  | (26.3 | ) |  | (1.4 | ) |  | 1.5 |
Foreign rate differences |  | 758.6 |  |  | 85.3 |  |  | (72.5 | )
Dividend from PRC investee |  | (169.8 | ) |  | (19.6 | ) |  | 30.1 |
Net loss from privately-held PRC investments |  | 45.6 |  |  | 2.5 |  |  | (2.6 | )
Other |  | 14.4 |  |  | 7.3 |  |  | (1.6 | )
Effective tax rate |  | (38.5 | %) |  | (2.8 | %) |  | 12.2 | %
Deferred tax assets and liabilities | Deferred tax assets and liabilities are summarized below (in thousands):
| As of December 31,
| 2014 | 2013
Deferred tax assets: |  |  |  |  |  |
Net operating loss | $ | 55,654 |  | $ | 51,818 |
Accruals and reserves not yet deductible |  | 4,517 |  |  | 4,985 |
Credits |  | 1,488 |  |  | 1,488 |
|  | 61,659 |  |  | 58,291 |
Deferred tax liabilities: |  |  |  |  |  |
Valuation of investment portfolio |  | — |  |  | (288 | )
|  | — |  |  | (288 | )
Net deferred tax assets |  | 61,659 |  |  | 58,003 |
Valuation allowance |  | (61,659 | ) |  | (58,003 | )
Net deferred tax assets | $ | — |  | $ | — |
Reconciliation of beginning and ending amount of the gross unrecognized tax benefits | A reconciliation of the beginning and ending amount of the gross unrecognized tax benefits is as follows (in thousands):
Gross unrecognized tax benefits balance as of December 31, 2013 | $ | 16,403 |
Add: |  |  |
Additions based on tax positions related to the current year |  | — |
Additions for tax positions of prior years |  | — |
Gross unrecognized tax benefits balance as of December 31, 2014 | $ | 16,403 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=32707879&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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